/*!
 * jQuery UI Menu @VERSION
 * http://jqueryui.com
 *
 * Copyright 2014 jQuery Foundation and other contributors
 * Released under the MIT license.
 * http://jquery.org/license
 *
 * http://api.jqueryui.com/menu/
 */
(function( factory ) {
    if ( typeof define === "function" && define.amd ) {

        // AMD. Register as an anonymous module.
        define([
            "jquery",
            "./core",
            "./widget",
            "./position"
        ], factory );
    } else {

        // Browser globals
        factory( jQuery );
    }
}(function( $ ) {

    return $.widget( "ui.menu", {
        version: "@VERSION",
        defaultElement: "<ul>",
        delay: 300,
        options: {
            icons: {
                submenu: "ui-icon-carat-1-e"
            },
            items: "> *",
            menus: "ul",
            position: {
                my: "left-1 top",
                at: "right top"
            },
            role: "menu",

            // callbacks
            blur: null,
            focus: null,
            select: null
        },

        _create: function() {
            this.activeMenu = this.element;

            // Flag used to prevent firing of the click handler
            // as the event bubbles up through nested menus
            this.mouseHandled = false;
            this.element
                .uniqueId()
                .addClass( "ui-menu ui-widget ui-widget-content" )
                .toggleClass( "ui-menu-icons", !!this.element.find( ".ui-icon" ).length )
                .attr({
                    role: this.options.role,
                    tabIndex: 0
                });

            if ( this.options.disabled ) {
                this.element
                    .addClass( "ui-state-disabled" )
                    .attr( "aria-disabled", "true" );
            }

            this._on({
                // Prevent focus from sticking to links inside menu after clicking
                // them (focus should always stay on UL during navigation).
                "mousedown .ui-menu-item": function( event ) {
                    event.preventDefault();
                },
                "click .ui-menu-item": function( event ) {
                    var target = $( event.target );
                    if ( !this.mouseHandled && target.not( ".ui-state-disabled" ).length ) {
                        this.select( event );

                        // Only set the mouseHandled flag if the event will bubble, see #9469.
                        if ( !event.isPropagationStopped() ) {
                            this.mouseHandled = true;
                        }

                        // Open submenu on click
                        if ( target.has( ".ui-menu" ).length ) {
                            this.expand( event );
                        } else if ( !this.element.is( ":focus" ) && $( this.document[ 0 ].activeElement ).closest( ".ui-menu" ).length ) {

                            // Redirect focus to the menu
                            this.element.trigger( "focus", [ true ] );

                            // If the active item is on the top level, let it stay active.
                            // Otherwise, blur the active item since it is no longer visible.
                            if ( this.active && this.active.parents( ".ui-menu" ).length === 1 ) {
                                clearTimeout( this.timer );
                            }
                        }
                    }
                },
                "mouseenter .ui-menu-item": function( event ) {
                    var target = $( event.currentTarget );
                    // Remove ui-state-active class from siblings of the newly focused menu item
                    // to avoid a jump caused by adjacent elements both having a class with a border
                    target.siblings( ".ui-state-active" ).removeClass( "ui-state-active" );
                    this.focus( event, target );
                },
                mouseleave: "collapseAll",
                "mouseleave .ui-menu": "collapseAll",
                focus: function( event, keepActiveItem ) {
                    // If there's already an active item, keep it active
                    // If not, activate the first item
                    var item = this.active || this.element.find( this.options.items ).eq( 0 );

                    if ( !keepActiveItem ) {
                        this.focus( event, item );
                    }
                },
                blur: function( event ) {
                    this._delay(function() {
                        if ( !$.contains( this.element[0], this.document[0].activeElement ) ) {
                            this.collapseAll( event );
                        }
                    });
                },
                keydown: "_keydown"
            });

            this.refresh();

            // Clicks outside of a menu collapse any open menus
            this._on( this.document, {
                click: function( event ) {
                    if ( this._closeOnDocumentClick( event ) ) {
                        this.collapseAll( event );
                    }

                    // Reset the mouseHandled flag
                    this.mouseHandled = false;
                }
            });
        },

        _destroy: function() {
            // Destroy (sub)menus
            this.element
                .removeAttr( "aria-activedescendant" )
                .find( ".ui-menu" ).addBack()
                .removeClass( "ui-menu ui-widget ui-widget-content ui-menu-icons ui-front" )
                .removeAttr( "role" )
                .removeAttr( "tabIndex" )
                .removeAttr( "aria-labelledby" )
                .removeAttr( "aria-expanded" )
                .removeAttr( "aria-hidden" )
                .removeAttr( "aria-disabled" )
                .removeUniqueId()
                .show();

            // Destroy menu items
            this.element.find( ".ui-menu-item" )
                .removeClass( "ui-menu-item" )
                .removeAttr( "role" )
                .removeAttr( "aria-disabled" )
                .removeUniqueId()
                .removeClass( "ui-state-hover" )
                .removeAttr( "tabIndex" )
                .removeAttr( "role" )
                .removeAttr( "aria-haspopup" )
                .children().each( function() {
                    var elem = $( this );
                    if ( elem.data( "ui-menu-submenu-carat" ) ) {
                        elem.remove();
                    }
                });

            // Destroy menu dividers
            this.element.find( ".ui-menu-divider" ).removeClass( "ui-menu-divider ui-widget-content" );
        },

        _keydown: function( event ) {
            var match, prev, character, skip, regex,
                preventDefault = true;

            function escape( value ) {
                return value.replace( /[\-\[\]{}()*+?.,\\\^$|#\s]/g, "\\$&" );
            }

            switch ( event.keyCode ) {
                case $.ui.keyCode.PAGE_UP:
                    this.previousPage( event );
                    break;
                case $.ui.keyCode.PAGE_DOWN:
                    this.nextPage( event );
                    break;
                case $.ui.keyCode.HOME:
                    this._move( "first", "first", event );
                    break;
                case $.ui.keyCode.END:
                    this._move( "last", "last", event );
                    break;
                case $.ui.keyCode.UP:
                    this.previous( event );
                    break;
                case $.ui.keyCode.DOWN:
                    this.next( event );
                    break;
                case $.ui.keyCode.LEFT:
                    this.collapse( event );
                    break;
                case $.ui.keyCode.RIGHT:
                    if ( this.active && !this.active.is( ".ui-state-disabled" ) ) {
                        this.expand( event );
                    }
                    break;
                case $.ui.keyCode.ENTER:
                case $.ui.keyCode.SPACE:
                    this._activate( event );
                    break;
                case $.ui.keyCode.ESCAPE:
                    this.collapse( event );
                    break;
                default:
                    preventDefault = false;
                    prev = this.previousFilter || "";
                    character = String.fromCharCode( event.keyCode );
                    skip = false;

                    clearTimeout( this.filterTimer );

                    if ( character === prev ) {
                        skip = true;
                    } else {
                        character = prev + character;
                    }

                    regex = new RegExp( "^" + escape( character ), "i" );
                    match = this.activeMenu.find( this.options.items ).filter(function() {
                        return regex.test( $( this ).text() );
                    });
                    match = skip && match.index( this.active.next() ) !== -1 ?
                        this.active.nextAll( ".ui-menu-item" ) :
                        match;

                    // If no matches on the current filter, reset to the last character pressed
                    // to move down the menu to the first item that starts with that character
                    if ( !match.length ) {
                        character = String.fromCharCode( event.keyCode );
                        regex = new RegExp( "^" + escape( character ), "i" );
                        match = this.activeMenu.find( this.options.items ).filter(function() {
                            return regex.test( $( this ).text() );
                        });
                    }

                    if ( match.length ) {
                        this.focus( event, match );
                        if ( match.length > 1 ) {
                            this.previousFilter = character;
                            this.filterTimer = this._delay(function() {
                                delete this.previousFilter;
                            }, 1000 );
                        } else {
                            delete this.previousFilter;
                        }
                    } else {
                        delete this.previousFilter;
                    }
            }

            if ( preventDefault ) {
                event.preventDefault();
            }
        },

        _activate: function( event ) {
            if ( !this.active.is( ".ui-state-disabled" ) ) {
                if ( this.active.is( "[aria-haspopup='true']" ) ) {
                    this.expand( event );
                } else {
                    this.select( event );
                }
            }
        },

        refresh: function() {
            var menus, items,
                that = this,
                icon = this.options.icons.submenu,
                submenus = this.element.find( this.options.menus );

            this.element.toggleClass( "ui-menu-icons", !!this.element.find( ".ui-icon" ).length );

            // Initialize nested menus
            submenus.filter( ":not(.ui-menu)" )
                .addClass( "ui-menu ui-widget ui-widget-content ui-front" )
                .hide()
                .attr({
                    role: this.options.role,
                    "aria-hidden": "true",
                    "aria-expanded": "false"
                })
                .each(function() {
                    var menu = $( this ),
                        item = menu.parent(),
                        submenuCarat = $( "<span>" )
                            .addClass( "ui-menu-icon ui-icon " + icon )
                            .data( "ui-menu-submenu-carat", true );

                    item
                        .attr( "aria-haspopup", "true" )
                        .prepend( submenuCarat );
                    menu.attr( "aria-labelledby", item.attr( "id" ) );
                });

            menus = submenus.add( this.element );
            items = menus.find( this.options.items );

            // Initialize menu-items containing spaces and/or dashes only as dividers
            items.not( ".ui-menu-item" ).each(function() {
                var item = $( this );
                if ( that._isDivider( item ) ) {
                    item.addClass( "ui-widget-content ui-menu-divider" );
                }
            });

            // Don't refresh list items that are already adapted
            items.not( ".ui-menu-item, .ui-menu-divider" )
                .addClass( "ui-menu-item" )
                .uniqueId()
                .attr({
                    tabIndex: -1,
                    role: this._itemRole()
                });

            // Add aria-disabled attribute to any disabled menu item
            items.filter( ".ui-state-disabled" ).attr( "aria-disabled", "true" );

            // If the active item has been removed, blur the menu
            if ( this.active && !$.contains( this.element[ 0 ], this.active[ 0 ] ) ) {
                this.blur();
            }
        },

        _itemRole: function() {
            return {
                menu: "menuitem",
                listbox: "option"
            }[ this.options.role ];
        },

        _setOption: function( key, value ) {
            if ( key === "icons" ) {
                this.element.find( ".ui-menu-icon" )
                    .removeClass( this.options.icons.submenu )
                    .addClass( value.submenu );
            }
            if ( key === "disabled" ) {
                this.element
                    .toggleClass( "ui-state-disabled", !!value )
                    .attr( "aria-disabled", value );
            }
            this._super( key, value );
        },

        focus: function( event, item ) {
            var nested, focused;
            this.blur( event, event && event.type === "focus" );

            this._scrollIntoView( item );

            this.active = item.first();
            focused = this.active.addClass( "ui-state-focus" ).removeClass( "ui-state-active" );
            // Only update aria-activedescendant if there's a role
            // otherwise we assume focus is managed elsewhere
            if ( this.options.role ) {
                this.element.attr( "aria-activedescendant", focused.attr( "id" ) );
            }

            // Highlight active parent menu item, if any
            this.active
                .parent()
                .closest( ".ui-menu-item" )
                .addClass( "ui-state-active" );

            if ( event && event.type === "keydown" ) {
                this._close();
            } else {
                this.timer = this._delay(function() {
                    this._close();
                }, this.delay );
            }

            nested = item.children( ".ui-menu" );
            if ( nested.length && event && ( /^mouse/.test( event.type ) ) ) {
                this._startOpening(nested);
            }
            this.activeMenu = item.parent();

            this._trigger( "focus", event, { item: item } );
        },

        _scrollIntoView: function( item ) {
            var borderTop, paddingTop, offset, scroll, elementHeight, itemHeight;
            if ( this._hasScroll() ) {
                borderTop = parseFloat( $.css( this.activeMenu[0], "borderTopWidth" ) ) || 0;
                paddingTop = parseFloat( $.css( this.activeMenu[0], "paddingTop" ) ) || 0;
                offset = item.offset().top - this.activeMenu.offset().top - borderTop - paddingTop;
                scroll = this.activeMenu.scrollTop();
                elementHeight = this.activeMenu.height();
                itemHeight = item.outerHeight();

                if ( offset < 0 ) {
                    this.activeMenu.scrollTop( scroll + offset );
                } else if ( offset + itemHeight > elementHeight ) {
                    this.activeMenu.scrollTop( scroll + offset - elementHeight + itemHeight );
                }
            }
        },

        blur: function( event, fromFocus ) {
            if ( !fromFocus ) {
                clearTimeout( this.timer );
            }

            if ( !this.active ) {
                return;
            }

            this.active.removeClass( "ui-state-focus" );
            this.active = null;

            this._trigger( "blur", event, { item: this.active } );
        },

        _startOpening: function( submenu ) {
            clearTimeout( this.timer );

            // Don't open if already open fixes a Firefox bug that caused a .5 pixel
            // shift in the submenu position when mousing over the carat icon
            if ( submenu.attr( "aria-hidden" ) !== "true" ) {
                return;
            }

            this.timer = this._delay(function() {
                this._close();
                this._open( submenu );
            }, this.delay );
        },

        _open: function( submenu ) {
            var position = $.extend({
                of: this.active
            }, this.options.position );

            clearTimeout( this.timer );
            this.element.find( ".ui-menu" ).not( submenu.parents( ".ui-menu" ) )
                .hide()
                .attr( "aria-hidden", "true" );

            submenu
                .show()
                .removeAttr( "aria-hidden" )
                .attr( "aria-expanded", "true" )
                .position( position );
        },

        collapseAll: function( event, all ) {
            clearTimeout( this.timer );
            this.timer = this._delay(function() {
                // If we were passed an event, look for the submenu that contains the event
                var currentMenu = all ? this.element :
                    $( event && event.target ).closest( this.element.find( ".ui-menu" ) );

                // If we found no valid submenu ancestor, use the main menu to close all sub menus anyway
                if ( !currentMenu.length ) {
                    currentMenu = this.element;
                }

                this._close( currentMenu );

                this.blur( event );
                this.activeMenu = currentMenu;
            }, this.delay );
        },

        // With no arguments, closes the currently active menu - if nothing is active
        // it closes all menus.  If passed an argument, it will search for menus BELOW
        _close: function( startMenu ) {
            if ( !startMenu ) {
                startMenu = this.active ? this.active.parent() : this.element;
            }

            startMenu
                .find( ".ui-menu" )
                .hide()
                .attr( "aria-hidden", "true" )
                .attr( "aria-expanded", "false" )
                .end()
                .find( ".ui-state-active" ).not( ".ui-state-focus" )
                .removeClass( "ui-state-active" );
        },

        _closeOnDocumentClick: function( event ) {
            return !$( event.target ).closest( ".ui-menu" ).length;
        },

        _isDivider: function( item ) {

            // Match hyphen, em dash, en dash
            return !/[^\-\u2014\u2013\s]/.test( item.text() );
        },

        collapse: function( event ) {
            var newItem = this.active &&
                this.active.parent().closest( ".ui-menu-item", this.element );
            if ( newItem && newItem.length ) {
                this._close();
                this.focus( event, newItem );
            }
        },

        expand: function( event ) {
            var newItem = this.active &&
                this.active
                    .children( ".ui-menu " )
                    .find( this.options.items )
                    .first();

            if ( newItem && newItem.length ) {
                this._open( newItem.parent() );

                // Delay so Firefox will not hide activedescendant change in expanding submenu from AT
                this._delay(function() {
                    this.focus( event, newItem );
                });
            }
        },

        next: function( event ) {
            this._move( "next", "first", event );
        },

        previous: function( event ) {
            this._move( "prev", "last", event );
        },

        isFirstItem: function() {
            return this.active && !this.active.prevAll( ".ui-menu-item" ).length;
        },

        isLastItem: function() {
            return this.active && !this.active.nextAll( ".ui-menu-item" ).length;
        },

        _move: function( direction, filter, event ) {
            var next;
            if ( this.active ) {
                if ( direction === "first" || direction === "last" ) {
                    next = this.active
                        [ direction === "first" ? "prevAll" : "nextAll" ]( ".ui-menu-item" )
                        .eq( -1 );
                } else {
                    next = this.active
                        [ direction + "All" ]( ".ui-menu-item" )
                        .eq( 0 );
                }
            }
            if ( !next || !next.length || !this.active ) {
                next = this.activeMenu.find( this.options.items )[ filter ]();
            }

            this.focus( event, next );
        },

        nextPage: function( event ) {
            var item, base, height;

            if ( !this.active ) {
                this.next( event );
                return;
            }
            if ( this.isLastItem() ) {
                return;
            }
            if ( this._hasScroll() ) {
                base = this.active.offset().top;
                height = this.element.height();
                this.active.nextAll( ".ui-menu-item" ).each(function() {
                    item = $( this );
                    return item.offset().top - base - height < 0;
                });

                this.focus( event, item );
            } else {
                this.focus( event, this.activeMenu.find( this.options.items )
                    [ !this.active ? "first" : "last" ]() );
            }
        },

        previousPage: function( event ) {
            var item, base, height;
            if ( !this.active ) {
                this.next( event );
                return;
            }
            if ( this.isFirstItem() ) {
                return;
            }
            if ( this._hasScroll() ) {
                base = this.active.offset().top;
                height = this.element.height();
                this.active.prevAll( ".ui-menu-item" ).each(function() {
                    item = $( this );
                    return item.offset().top - base + height > 0;
                });

                this.focus( event, item );
            } else {
                this.focus( event, this.activeMenu.find( this.options.items ).first() );
            }
        },

        _hasScroll: function() {
            return this.element.outerHeight() < this.element.prop( "scrollHeight" );
        },

        select: function( event ) {
            // TODO: It should never be possible to not have an active item at this
            // point, but the tests don't trigger mouseenter before click.
            this.active = this.active || $( event.target ).closest( ".ui-menu-item" );
            var ui = { item: this.active };
            if ( !this.active.has( ".ui-menu" ).length ) {
                this.collapseAll( event, true );
            }
            this._trigger( "select", event, ui );
        }
    });

}));
